I've ended up deciding for myself to never write JS and instead using TypeScript. So far it's working well. I just couldn't really see all that random guessing

I've ended up deciding for myself to never write JS and instead using TypeScript. So far it's working well. I just couldn't really see all that random guessing by the IDE as an advantage. If the only way to figure out whether the code is broken is to run it, then it's pointless to guess potential problems on every single expression because dealing with those takes more time than just testing the code – or results in the developer completely ignoring all diagnostics.